Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5a25427360ecbb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 02:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfc63c769e5faccdfb446aea21be4c6b SHA-1: aeaab09fb6480b1adf213c9dfb37a9a20003a567 SHA-256: df5a25427360ecbb6ac879bd9b5825c2326a30dc26e667f0904a9ac1f0af0472
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The primary attack pattern involves luring users to click on these links, likely leading to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4578

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16131b70605c9c---pigutanapisatakeferinif.pdf In PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/selajeruzobikeguluzopa.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/kotenajudax.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109060212133112.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/31922998857.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/tejitoxesoxivafizonanu.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/wokanubali.pdfIn PDF document text
    • http://cocoal.com/uploads/file/gafifimimotosokogerisumid.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/xuwudipuvevidogez.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/gulexesir.pdfIn PDF document text
    • http://hueide.com/upload/files/95888406292.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/gapiwuvum.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qvjkitu5eneaalh4luo7j9u9ue/danubew.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/61958292283.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce14baf4c.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/xowojavazos.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/94458943222.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210908122709.pdfIn PDF document text
    • https://vendax.ro/files/file/23988868123.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/28112593140.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161390673545b2---dezedasimafupux.pdfIn PDF document text
    • http://imi.vc/upload/files/palipufofuwagukipi.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/liwegepuzat.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/duwixixux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+auto+apps+australiaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 18272 bytes
SHA-256: 460e238f634dacf183eacd49d8c44415287adffaf9ae33112cb780db3d31708b
font_01_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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